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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Publisher: IEEE
Languages: English
Types: Part of book or chapter of book
Subjects: UOW3
A delta-sigma modulator (DSM) can be thought as a nonlinear chaotic system that may exhibit tonal behaviour in its output spectrum. These tones are sometimes referred to as spurs and they are undesirable. To provide for the mitigation of structured tones, application of dithering, using chaotic modulators, loading irrational initial conditions and maintaining controllable maximum sequence lengths are commonly used and advised methods primarily in Multi-stAge noise SHaping (MASH) DSMs. Higher order MASH-DSMs are less problematic and are commonly used in many high speed and low noise frequency synthesiser circuits. As MASH is composed of cascaded first order digital DSM stages, it is unconditionally stable. In this paper, the tone mitigation techniques for MASH 1-1-1 and MASH 1-1-1-1 modulators are compared and their noise performances presented.
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    • [1] S. Pamarti and I. Galton, “LSB Dithering in MASH Delta-Sigma D/A Converters,” IEEE Transactions on Circuits and Systems-I:Regular Papers, vol.54, no 4, April 2007, pp. 779-790.
    • [2] A.Reddy, “Noise Shaping with Sigma Delta Modulators in Fractional-N Synthesizers”, RFIT2007-IEEE International Workshop on Radio-Frequency Integration Technology, Dec. 9-11 2007, Singapore, pp. 329-332.
    • [3] K.Hosseini and M .P. Kennedy, “Mathematical Analysis of a Prime Modulus Quantizer MASH Digital Delta-Sigma Modulators”, IEEE Transactions on Circuits and SystemsII:Express Briefs, vol.54, no 12, December 2007, pp. 1105- 1109.
    • [4] M.J. Borkowski and J. Kostamovaara, “Spurious Tone Free Digital Delta-Sigma Modulator Design for DC Inputs”, IEEE ISCAS Conference, 23-26 May 2005, pp. 5601-5604.
    • [5] K.Hosseini and M .P. Kennedy, “Maximum Sequence Length MASH Digital Delta-Sigma Modulators”, IEEE Transactions on Circuits and Systems-I:Regular Papers,
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